JP2630795B2 - Photo engraving system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scaled-down photoengraving system.

"Prior art and its problems" Conventionally, a photoengraving system for producing a printing plate for offset printing has generally used the same-magnification photography and close contact (equal-magnification) exposure. That is, a plate is photographed at the same magnification on a lithographic film, and this is exposed in close contact on a PS plate (which refers to all of the photosensitive material to be a printing plate for offset printing), and developed to obtain a printing plate. In the case of a page, on a sheet of paper, the number of imprinted films on the board should be imposed (8 sheets for 8 sheets, 16 sheets for 16 sheets).
The sheets are arranged in a predetermined order and imposed, and this is closely exposed to a PS plate. However, in this conventional photoengraving system, the cost of the film is high because the underprint is photographed at the same magnification on the squirrel film and then photographed at the same magnification on the PS plate, and the space and cost for storing these are also high. There was a problem of high. Furthermore, the workability of the imposition work is poor, and the skilled person must rely on them.

Against this background, some reduction / enlargement photoengraving systems have been proposed and put into practical use, in which the composition is reduced in size, enlarged and automatically exposed (imposed) on the PS plate. However, the conventionally proposed reduction / enlargement photoengraving system has a reduction photographing camera capable of changing a reduction magnification according to a document size, and a projection magnification corresponding to a photographed image of a composition. The apparatus has a magnifying projection printing machine separately, and the apparatus is large and expensive.

In addition, this conventional system is applicable to dictionaries, novels,
It is limited to printed matter consisting only of line drawings such as telephone directories and comics. In other words, the technical idea of this conventional system is
Regardless of the size of the original, a fixed size film (35
The original image is created on a mm film) and is enlarged and projected according to the size of a printed matter such as a book. The resolution on the PS plate is not a problem. For this reason, with respect to a composition having a large reduction / enlargement ratio, the resolution is inevitably reduced, and the printing target is limited by the reduced resolution, so that it can be used only for printing the target. It is.

Further, since this conventional reduced / enlarged photoengraving system is based on the idea of changing the reduction magnification in accordance with the size of the composition, the photographing magnification must be set for each composition and photographing must be performed. Therefore, the setting of the composition to the photographing position must be performed individually for each composition, and the work efficiency is very poor.

"Object of the Invention" Accordingly, the present invention maintains the resolution of a plate image on a PS plate at the time of enlarged projection exposure, and is sufficiently used for printing a precise underprinted page such as a halftone dot photograph. The goal is to get a system that can do it.

Another object of the present invention is to provide a device capable of automatically and accurately setting a large number of compositions at a photographing position of a camera.

`` Summary of the Invention '' The present invention does not change the reduction magnification according to the size of the composition, but unifies the size of the composition by keeping the reduction magnification constant, so that on the PS plate at the time of enlargement projection exposure It has been completed based on the idea of maintaining the resolving power of the underprint.

Further, the present invention has been completed based on the idea that, as an indirect means for unifying the size of the composition, the mount on which the copy is to be attached is a fixed-size mount.

That is, according to one aspect of the reduced-enlarged photoengraving system of the present invention, in a photoengraving system that forms a printing plate by enlarging and photographing an engraved image by an engraving camera, and It is characterized in that a fixed form board to be attached is provided, and the composition attached to the fixed form board is photographed by the composition photographing camera at the same reduction magnification according to the size of the fixed form board.

According to another aspect of the present invention, there are provided a plurality of mounts on which a copy is to be attached; a mount transfer device configured to transfer the mount to a shooting position of a copy shooting camera; A conveyance detecting means for detecting that the paper has been conveyed to the photographing position and stopping the conveyance of the mount by the mount conveying device; and a mount positioning device for positioning the mount at the photographing position when the conveyance detecting means detects the mount. It is characterized by having.

"Examples of the Invention" The present invention will be described below with reference to illustrated examples. FIG. 1 shows a reduced photographing state by a composition photographing camera using a photographing position setting device for the composition.

The composition photographing camera is configured as a dual-purpose camera 10. The dual-purpose camera 10 includes a body 11 and a lens barrel 13 having a lens 13a, which is detachable from a detachable flange 12 of the body 11. This dual purpose camera 10
5 will be described in detail with reference to FIG. 5. The body 11 has a pair of film magazine chambers 15 and 16 on the left and right of an aperture 14 for regulating the screen size.
A feed-side film magazine 17 and a take-up film magazine 18 can be inserted into and removed from 5 and 16, respectively. The sending-side film magazine 17 holds the unphotographed roll film F1 or the developed roll film F2, and takes up the winding-side film magazine.
The guide roller 19 exits the film magazine 17 on the sending side.
And the film drawn out through the sprocket 20 is wound and held.

The film held in the film magazine 17 on the sending side and the film magazine 18 on the winding side can be of any size depending on the purpose.
When photographing at front and rear magnifications, it is desirable to use a 70 mm wide film. According to the width of 70 mm, as shown in FIG. 9, even if a perforation P meshing with the sprocket 20 is provided on both sides, the A4 plate can be photographed in a horizontal position, and a stable film feed by perforation can be obtained. it can.

A pair of parallel flat transparent pressure plates 21 that sandwich and hold the unphotographed roll film F1 or the developed roll film F2 and maintain their flatness are located behind the aperture 14. One of the parallel plane transparent pressure plates 21 is a fixed pressure plate 21.
a, the other is a movable pressure plate 21b. The movable pressure plate 21 is separated from the fixed pressure plate 21a at the time of feeding the film, and moves to the fixed pressure plate 21a side at the time of photographing and projection to hold the film between the two windings.

FIG. 6 shows an example of the configuration, in which a fixed pressure plate 21a is held by a holding frame 22 and fixed to the back surface of the aperture 14. The movable pressure plate 21b is supported by a guide pin 24 implanted in the camera back cover 30 via the holding frame 23 so as to be able to contact and separate from the fixed pressure plate 21a, and is urged toward the fixed pressure plate 21a by the compression spring 25 to be supported. Have been. The cam followers 26 are fixed to the upper and lower ends of the holding frame 23 of the movable pressure plate 21b, and the cam followers 26 are in contact with the eccentric cams 27, respectively. Eccentric cam 27
The center of rotation 01 and the center 02 of the peripheral surface are eccentric by e. The eccentric cam 27 rotates in synchronization with the film feeding mechanism.When the film is fed, the movable pressure plate 21b is pushed up via the cam follower 26, and when the film is fed by one frame and stopped, the movable pressure plate 21b is compressed. The spring 25 pushes the fixed pressure plate 21a.

The camera back cover 30 of the body 11 is provided with a light-transmitting hole 31 at a position corresponding to the screen of the film.
A light-shielding lid 32 is detachable from 31. This shading lid
32 is attached to the light transmitting hole 31 at the time of reduction photographing and the body 11
The inside of the camera is shielded from light, and the translucent
Removed from 31.

A parallel plane transparent plate 35 is held and held by a holding frame 36 at a below-plate shooting position of the dual-purpose camera 10. The focal length of the lens 13a of the dual-purpose camera 10 is fixed on the lower surface of the parallel flat transparent plate 35, and the focal length is fixed. Accordingly, the dual-purpose camera 10 keeps the distance between the film and the lower surface of the parallel flat transparent plate 35 constant, and if the subject (printing) is aligned with this lower surface, the photographing magnification for the subject is kept constant.

Below the parallel plane transparent plate 35, which is the shooting position of the dual-purpose camera 10, a composition 38 is set.
Pasted on 37. As shown in FIG. 4, the fixed size mount 37 has a size larger than the size corresponding to the size of the composition 38 (for example, A4 size), and a scale 39 serving as a guide when attaching the composition 38 is printed on one surface. Have been. The scale 39 has at least an outline 38a corresponding to the outline of the block 38 and an orthogonal line 39b representing the center position of the fixed form 37. The outline 39a serves as a guide of the maximum size of the composition 38. In addition, the orthogonal line 39b, outside the orthogonal portion is an index of the center position of the standard mount 37, divides the underprint pasting surface into four equal parts, and a plurality of small-sized underprints 38 are divided into separate pasting surfaces. It also serves as an index line when each is attached at the same time. Therefore, the operator, for example, looks at the orthogonal line 39b, and
By adjusting to 9a, the composition 38 can be easily stuck at a fixed position on the fixed form mount 37. In the left and right margins outside the outer shape line 39a of the fixed form mount 37, a positioning hole 37a into which a positioning pin 61 of the mount positioner 60 is fitted at the center of the opposite side.
Are formed.

In order to convey the above-mentioned fixed form paper 37 under the parallel plane transparent plate 35 and carry it out after photographing, a plurality of conveyor belts 42 are wound parallel to each other between the pair of pulleys 41 under the parallel plane transparent plate 35. A mount carrier device 40 is provided. The mount carrier device 40 includes a drive motor 43 provided on one of the pulleys 41.
Then, the conveyor belt 42 is moved in the direction of the arrow. The transport belt 42 is arranged to move below the parallel flat transparent plate 35. Mount guides 44 are provided on both sides of the transport belt 42. The mount guide 44 guides both ends of the fixed mount 37 on the conveyor belt 42 to regulate the position thereof.

A document detection sensor 51 whose front end faces the lower surface of the holding frame 36 is arranged at a lower position of the front end of the holding frame 36. The document detection sensor 51 detects the front end of the fixed form paper 37 that has been conveyed below the parallel flat transparent plate 35 that is the photographing position by the conveyance belt 42, and stops the conveyance operation of the mount conveyance apparatus 40. .

A stopper 52 is provided at a position near the document detection sensor 51 and between the transport belts 42 located at the center. The stopper 52 is used to stop the fixed mount 37 at a fixed position below the parallel flat transparent plate 35.
2b can swing to an interference position where it abuts the lower surface of the front end of the holding frame 36 and interferes with the front end of the fixed form 37, and a non-interfering position with respect to the fixed form 37. And this stopper 52 is a compression spring
53 is urged to oppose the interference position, and
Other than the fixed position arrangement, the solenoid 54 retracts to the non-interference position.

Under the parallel plane transparent plate 35, a mount positioning device 60 is provided. This mount positioning device 60 is for positioning the standard mount 37 at a fixed position below the parallel flat transparent plate 35 and matching the copy 38 with the shooting position of the dual-purpose camera 10.
A pair of positioning pins 61 fitted into the positioning holes 37a of the 37,
A plurality of compression springs 63 for urging the positioning pin 61 upward through the connecting plate 62, and a pair of solenoids 64 for retracting the positioning pin 61 to the lowered position except when the fixed form board 37 is arranged at the fixed position are provided. The positioning pin 61 is
The tip is tapered so that it can easily fit into a, and its base is configured to fit into the positioning hole 37a without a gap. Therefore, this positioning pin 61 is
When fitted in a, the fixed form paper 37 is accurately positioned at a fixed position below the parallel flat transparent plate 35 by the positioning pins 61. The hole 36a formed at a position corresponding to the positioning pin 61 of the holding frame 36 is an escape hole for the positioning pin 61.

The compression spring 63 also urges the push-up plate 65 to face the lower surface of the parallel flat transparent plate 35 through the connecting plate 62 so as to be in close contact therewith. The push-up plate 65 is in close contact with and separates from the lower surface of the parallel flat transparent plate 35 via the transport belt 42.
When the standard mount 37 comes to the fixed position under the parallel flat transparent plate 35, the underlay 38 is brought into close contact with its lower surface by the compression spring, and is retracted to the lowered position by the solenoid 64 except when the standard mount 37 is arranged at the fixed position. . The pins 66 protruding above the solenoid 64 are guides for raising and lowering the connecting plate 62.

Hereinafter, the operation of the printing position setting device for the composition according to the above configuration, and the reduced shooting state and the enlarged projection state of this system will be described.

The dual-purpose camera 10 is used to reduce the size of FIG.
As shown in the figure, a light-shielding lid is
It becomes a composition shooting camera in a light-shielded state with 31 attached,
The image capturing position setting device 70 as a reduction image capturing device is fixed on a dual-purpose camera support substrate 71. The support substrate 71 is parallel to the parallel plane transparent plate 35, and is parallel to the parallel plane transparent plate 35.
Above the illuminating lamp 730 that uniformly illuminates the underlay 38 conveyed by the mount carrier 40 under the parallel flat transparent plate 35
Are arranged. The support substrate 71 is supported by the columns 74.

An unphotographed roll film F1 is loaded in the sending-side film magazine 17 of the body 11, and the leading end thereof is wound into the winding-side film magazine 18 via the guide roller 19 and the sprocket 20. The lens 13a of the dual-purpose camera 10 is
The focal position is adjusted to the lower surface of the parallel plane transparent plate 35, and the focal length is fixed. The positioning pin 61 is retracted to the lowered position and the push-up plate 65 is retracted to the separated position by the solenoid 64, and the stopper 52 is retracted to the non-interference position by the solenoid.

In this state, when the fixed form 37 with the block 38 attached to a predetermined position is put on the conveyor belt 42 and the start switch is pressed, the pulley 41 is rotated by the drive motor 43, and the conveyor belt 42 moves in the direction of the arrow. . When the standard mount 37 is carried under the parallel flat transparent plate 35 by the movement of the conveyor belt 42, the excitation of the solenoid 54 is released, and the stopper 52 retracted to the non-interference position is moved to the interference position by the compression spring 53. It swings and contacts the lower surface of the front edge of the holding frame 36. And this stopper
When the leading edge 52b of the 52 comes in contact with the leading edge of the fixed form 37 and the feed thereof is stopped, the original detection sensor 51 detects the fixed form 37 and stops the drive motor 43 at the same time. with this,
The standard mount 37 is arranged at a low position below the parallel flat transparent plate 35, which is a shooting position of the dual-purpose camera 10, and its positioning hole 37a faces the positioning pin 61. At this time, the excitation of the solenoid 64 is released, and the positioning pins 61 connected by the connecting plate 62 are released.
And the push-up plate 65 are integrally raised by the compression spring 63, the positioning pins 61 are fitted into the positioning holes 37a without any gap, and the push-up plate 65 is in close contact with the fixed mount 37 via the transport belt 42 on the lower surface of the parallel flat transparent plate 35 Let it. With this, the composition 38 is accurately positioned at the shooting position, and the composition 38 is a parallel flat transparent plate.
The shooting area is parallel plane transparent plate 35
It is located at the focal position on the lower surface. Therefore, a certain focus accuracy is obtained for the composition 38 irrespective of its thickness.

In this state, the dual-purpose camera 10 captures an image of the composition 38 on the unphotographed roll film F1. At the time of this photographing, when the photographing of one block 38 is completed and the film feeding operation is started, the movable pressure plate 21b is linked with the fixed pressure plate 21a in conjunction with this.
Rise against. And when the film advance is completed,
The fixed pressure plate 21a approaches the movable pressure plate 21b again and clamps the film therebetween, thereby maintaining the flatness of the film.

When the shooting for one frame is completed, the solenoid 54 and the solenoid 64
Are simultaneously excited, the stopper 52 retracts to the non-interference position against the bias of the compression spring 53, and the positioning pin 61 and the push-up plate
65 returns to the lowered position against the urging force of the compression spring 63.
Immediately after this, the drive motor 43 is driven to move the conveyor belt 42, and the fixed form paper 37 is carried out of the shooting position. Then, when the document detection sensor 51 detects the unloading of the fixed form paper 37, the excitation of the solenoid 54 is released, the stopper 52 swings again to the interference position by the compression spring 53, and the next fixed form paper conveyed. Stop 37. Hereinafter, by the same operation as described above, the standard mount 37 is positioned at a fixed position below the parallel plane transparent plate 35, and the underlay 38 is focused on the lower surface of the parallel plane transparent plate 35.

When the photographing of the images 38a of all the composition 38 is completed, the unphotographed roll film F1 is developed (FIG. 9). The developed roll film F2 is then re-used
10 is supported in the film magazine 17 on the delivery side, and the leading end is similarly wound on the film magazine 18 on the winding side.

The dual-purpose camera 10 which has completed the setting of the developed roll film F2 as described above, with the light-shielding lid 32 removed, as shown in FIG.
Supported on 81. The machine with an enlarged projection surface 80 is a PS plate holder 82
The XY board 81 can be moved in the XY direction on the PS plate holder 82 in parallel with the XY board 81 on the PS plate holding table 82. Although various types of such XY moving devices are well known, in the illustrated example, an X-direction rail 84 is provided on a support 83 erected on a PS plate holding table 82, and an X-direction rail 84 is provided. An X-direction traveling body 85 is supported on the rail 84 so that it can travel freely. The X-direction traveling body 85 includes a Y-direction guide rail 86 orthogonal to the X direction.
The substrate 81 is movably supported (see also FIG. 10 for the X and Y directions).

On the XY substrate 81, it is located on the optical axis of the lens 13a,
An ultra-high pressure mercury lamp 87 as an illumination lamp is provided,
The light from the ultra-high pressure mercury lamp 87 passes through the light transmitting hole 31 and the parallel flat transparent pressure plate 21 and is given to the developed roll film F2.
38a (FIG. 9) is converted to a PS plate 88 via the lens 13a, and a copy image 38b is formed.
(FIGS. 8 and 10).

The projected image 38 on the PS plate 88 by the machine 80 with the enlarged projection plane
In the projection exposure of a, the XY substrate 81 is moved in the XY direction with a predetermined locus, and if there are eight planes on one PS plate 88, the underlay images 38b of the eight underlays 38 are converted into pages. Exposure is performed in a predetermined arrangement. FIG. 10 is a plan view in the case of eight surfaces.

The PS plate 88 on which the exposure of the eight underlay images 38b has been completed is then developed and completed as a printing plate.

The lens 13a is integrally provided with an interference filter 13f that transmits only light of a narrow wavelength including 436 nm (g-line). The g-line is located in the photosensitive area of the film F1 of the dual-purpose camera 10 as a composition photographing camera, and in the spectral distribution of the extra-high pressure mercury lamp 87, which is an illumination light source of the magnifying projection plane attaching device 80, the g-line is g-line. line is included. Therefore, the image 38b of the underprint 38 formed on the PS plate 88 is an image using a narrow wavelength range and having no chromatic aberration.

The multipurpose camera 10 accurately positions the projected image 38a on the developed roll film F2 at the time of the enlarged projection.
7 and 8 in order to match
A positioning marker / detector 28 as shown in the figure can be provided. The positioning marker / detector 28 is used every time the photographed image 38a is photographed on the unphotographed roll film F1.
This is for imprinting the marker 29 shown in the figure. At the time of enlarged projection, if this marker 29 is detected by the positioning marker / detector 28 and the feeding of the developed roll film F2 is stopped,
The position of the captured image 38a can be accurately matched with the aperture 14. Thus, the positioning marker and detector 28 is
For example, it can be obtained by making one end of the optical fiber face the film and arranging a printing light source and a reflection type optical sensor at the other end.

Although the present invention does not ask about the reduction magnification and the enlargement magnification, as described above, when the size of the composition is up to A4 plate and the film is 70 mm wide, the reduction / enlargement magnification is 1/4.
It is fixed at 2x (4x), and a resolution of about 30 lines / mm is obtained on the PS plate 88. This resolving power is a resolving power that can well reproduce a halftone photograph of about 133 lines / inch, and therefore, with the present reduced / enlarged photoengraving system, it is possible to print a wider range of printed matter such as a page including a halftone photograph. .

[Effects of the Invention] As described above, according to the present invention, the composition is photographed by the composition photographing camera at the same reduction magnification according to the size of the standard mount, so that the magnification is fixed at the time of enlargement projection exposure. If this is done, the resolution of the underprint image on the PS plate is maintained, and the present system can be applied to pages and the like that require higher resolution.

Further, according to the present invention, the underlaying backing sheet conveyed to the photographing position of the photographing camera by the backing sheet conveyance device is detected by the conveyance detection device, the conveyance is stopped, and the mount is positioned at the fixed position by the mounting sheet positioning device. The composition can be automatically and accurately arranged at the shooting position.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a printing position setting device applied to the present invention together with a dual-purpose camera, FIG. 2 is an enlarged view of a main part of the shooting position setting device, and FIG. FIG. 4 is a plan view of a photographing position setting device, FIG. 4 is a plan view of a standard mount forming the present invention, FIG.
6 is a cross-sectional view taken along the line VI-VI of FIG. 5, FIG. 7 is a front view conceptually showing a state of reduced photographing of the composition by the dual-purpose camera, and FIG. 8 is a conceptual view of the same enlarged projection. Front view,
FIG. 9 is a plan view showing an example of a photographed image and a positioning marker on a film, and FIG. 10 is a plan view showing an example of formation of an underprint image on a PS plate in the case of eight faces. 10: Dual-purpose camera, 11: Body, 12: Detachable flange, 13: Lens, 14: Aperture, 15, 16: Magazine chamber, 17: Feed-side film magazine, 18: Winding-side film Magazine, 19: Guide roller, 20: Sprocket, 21: Parallel flat transparent pressure plate, 21a: Fixed pressure plate, 2
1b: movable pressure plate, 26: cam follower, 27: eccentric cam, 28: positioning marker / detector, 29: marker, 30
… Back cover, 31… Transparent hole, 32… Light-shielding cover, 35… Parallel plane transparent plate, 36… Holding frame, 37… Mount, 38… Underprint, 38
a …… photographed image, 38b …… engraving image, 39 …… scale, 40 ……
Mount carrier, 41… Pulley, 42… Transport belt, 44 Mount guide, 51… Original detection sensor, 52… Stopper,
53: Compression spring, 54: Solenoid, 60: Mount positioner, 61: Positioning pin, 62 connecting plate, 63: Compression spring, 64: Solenoid, 65: Push-up plate, 70: Shooting position Set device, 71 ... Support substrate, 72 ... Underlay support,
80 ……………………………………………………………………………………………………………………………………………………….

Claims (3)

(57) [Claims] In a photoengraving system for forming a printing plate by enlarging a photograph by engraving a photograph by a composition photographing camera and forming a printing plate by enlarging the photographed image, a fixed mounting sheet on which the printing composition is to be attached is provided. A reduced-enlarged photoengraving system characterized in that the pasted composition is photographed by a composition photographing camera at the same reduction magnification according to the size of the fixed form mount. 2. A reduced-enlarged photoengraving system according to claim 1, wherein the fixed-size mounting sheet is provided with a positioning hole and a scale serving as a guide when attaching an underprint. 3. A photoengraving system for reducing the size of a composition by a composition photographing camera and enlarging the photographed image to form a printing plate, comprising: a plurality of mounts on which the composition is to be pasted; A mount conveying device that conveys the mount to the photographing position and unloads the mount after the photographing is completed; and conveyance detecting means that detects that the mount is conveyed to the photographing position and stops conveying of the mount by the mount conveying device. And a mount positioning device for positioning the mount at the photographing position when the conveyance detecting means detects the mount.